Stop calling people. Write a 1-page letter, send it certified mail to the corporate office. Someone with power will actually read it. I did this concerning my $50 rebate from AT&T after the store manager basically told me to screw off. In the letter, I documented all visits and conversations. I noted dates, times, and NAMES. I also threatened to contact the Better Business Bureau if the issue was not resolved by this letter. They gave me a $50 credit on my bill to account for the missing $50 rebate, and all was right with the world again 🙂